2.9BSD - /usr/src/cmd/eqn/fromto.c

   1: # include "e.h"
   2: 
   3: fromto(p1, p2, p3) int p1, p2, p3; {
   4:     int b, h1, b1, pss;
   5:     yyval = oalloc();
   6:     lfont[yyval] = rfont[yyval] = 0;
   7:     h1 = eht[yyval] = eht[p1];
   8:     b1 = ebase[p1];
   9:     b = 0;
  10:     pss = EFFPS(ps);
  11:     ps += 3;
  12:     nrwid(p1, ps, p1);
  13:     printf(".nr %d \\n(%d\n", yyval, p1);
  14:     if( p2>0 ) {
  15:         nrwid(p2, pss, p2);
  16:         printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, yyval, yyval, p2);
  17:         eht[yyval] += eht[p2];
  18:         b = eht[p2];
  19:     }
  20:     if( p3>0 ) {
  21:         nrwid(p3, pss, p3);
  22:         printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p3, yyval, yyval, p3);
  23:         eht[yyval] += eht[p3];
  24:     }
  25:     printf(".ds %d ", yyval);   /* bottom of middle box */
  26:     if( p2>0 ) {
  27:         printf("\\v'%du'\\h'\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d",
  28:             eht[p2]-ebase[p2]+b1, yyval, p2, pss, p2, EFFPS(ps));
  29:         printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
  30:             yyval, p2, -(eht[p2]-ebase[p2]+b1));
  31:     }
  32:     printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
  33:         yyval, p1, p1, yyval, p1);
  34:     if( p3>0 ) {
  35:         printf("\\v'%du'\\h'-\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d\\h'\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
  36:             -(h1-b1+ebase[p3]), yyval, p3, pss, p3, EFFPS(ps), yyval, p3, (h1-b1+ebase[p3]));
  37:     }
  38:     printf("\n");
  39:     ebase[yyval] = b + b1;
  40:     if(dbg)printf(".\tfrom to: S%d <- %d f %d t %d; h=%d b=%d\n",
  41:         yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
  42:     ofree(p1);
  43:     if( p2>0 ) ofree(p2);
  44:     if( p3>0 ) ofree(p3);
  45: }

Defined functions